Our own Dr Williams was a guest on BBC Radio Cymru Cymru panel talking about his passion for photographing wildlife recently.
Here are some examples of his amazing work:
You can hear the show in Welsh in this link:
Galwad Cynnar - 16/09/2023 - BBC Sounds
Gerallt Pennant a'i westeion yn trafod natur, bywyd gwyllt a chadwraeth.